Technical description and composition of the THOMSON T24C99H TV, panel type and modules used. The composition of the modules.THOMSON
Model: T24C99H CVMV26L-A
Panel: M236H1-L01 Rev. C2
T-CON: LM215WF4-TLE7
Inverter (backlight): MLT019L-CJ Rev1.0 KB5150
PWM Inverter: AZ7500EP-E1 (16)
Power Supply (PSU): MLT019L-CJ Rev1.0
PWM Power: AZ7500EP-E1 (16), KB5150
MOSFET Power: K6A60D
MainBoard: CVMV26L-A-20
IC MainBoard: TSUMV26KE-LF, YD1517P, K24C32, CVMV26L-A
Tuner: F21WT-3BAR-E
Specifications T24C99H
THOMSON T24C99H
General recommendations for TV LCD repair
Possible malfunctions
- The THOMSON T24C99H TV does not turn on, does not respond to the remote control and control panel buttons, the indicators do not light up or flash.
Most likely, in this case, the main switching power supply (SMPS) MLT019L-CJ is faulty. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches (K6A60D) and rectifier diodes for possible partial or complete breakdown.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually work in an emergency in the short-circuit mode, and with a short circuit in the power elements of the primary circuit, the mains fuse often breaks.
Mos-Fet power switches used in switching power supplies sometimes fail due to a malfunction of any other elements that can disable it in the key mode, or create an excess of the maximum permissible key parameters. These can be elements supplying a PWM regulator, frequency setting or damper circuits, or elements of negative feedback in the stabilization circuit. PWM controllers AZ7500EP-E1 (16), KB5150, in the absence of visible damage or outright short circuits between the terminals, are checked by replacing them with new ones, or knowingly working properly.
- There is no image, there is sound, it reacts to the remote control. Or, immediately after switching on for a second, the image may appear and immediately disappear.
The defect can be caused by problems in the nodes or elements of the display backlight, or in the power supply of the lamps or the inverter.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken during work, and the protective circuits must be restored immediately after the repair is completed.
- The TV does not turn on, the indicator signals the standby or operating mode, or blinks.
Repair or diagnostics of the CVMV26L-A-20 motherboard should begin with checking the stabilizers and power converters necessary to power the microcircuits and matrix. If necessary, you should update or replace the software (software). In cases of complex MB (SSB) repairs and with the necessary skills and equipment, it may sometimes be necessary to replace its TSUMV26KE-LF, YD1517P, K24C32, CVMV26L-A chips and other possible faulty components. Malfunctions associated with the use of BGA soldering technologies are usually easily diagnosed by the warm-up method.
If you suspect a malfunction of the F21WT-3BAR-E tuner, first of all, you need to make sure that the software is correct, as well as the presence of the necessary levels of supply voltages and pulses of data exchange with the processor via the I2C bus on the corresponding terminals of the tuner.
The lack of an image in the presence of a signal from the THOMSON T24C99H is often caused by a malfunction of the display backlight. Moreover, the problem can be both inside the LCD panel (matrix) M236H1-L01 Rev.C2, for example, a malfunction of CCFL (EEFL) lamps, and outside in their power source - an inverter.
Without backlighting, sometimes you can see a barely noticeable image with a certain successful hit of external light on the screen.
Often, to repair the backlight, disassembling the LCD panel M236H1-L01 is required - a painstaking process that requires increased attention and accuracy from the master. In such cases, there is a possibility, with the slightest negligence, to damage the glass or loops and the TV may become unrepairable.
We strongly do not recommend doing such work to owners of TVs and craftsmen who do not have experience in repairing LCD panels! Moreover, at home (at the owner's home).
If there is no image in the presence of backlight, the screen becomes slightly lighter when turned on, and if the TV is open, the light from the lamps can be seen through the holes in the panel case.
In this case, there may be a malfunction inside the panel, damage to strips, loops, the T-CON board (Timing Controller) may be defective. But often the main board MainBoard CVMV26L-A-20 turns out to be faulty, a software failure is also possible.
In such cases, the master first of all needs to check the main supply voltage of the panel at the LVDS connector, the fuses on the T-CON board or the panel brackets, as well as the supply and reference voltages for line and column drivers - VGH, VGL, Vcom.
If all of the above measurements are within the normal range, then the oscilloscope should track the passage of LVDS signals from the MainBoard CVMV26L-A-20, as well as synchronizing signals from T-CON to loops with drivers.
Remember! Attempts to self-repair the THOMSON T24C99H TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
Additional MainBoard RepairThe appearance of the MainBoard CVMV26L-A-20 is shown in the figure below:
CVMV26L-A-20
The CVMV26L-A-20 motherboard uses a TSUMV26KE-LF (TSUMV36KE-LF) processor, combined with a scaler, SPI FLASH 520Kb and EEPROM 24C02C.
It is advisable to start repairing the MainBoard with checking the voltage converters and linear stabilizers, which are necessary to provide power in operating and standby modes. Check the power supply of the LCD panel 5V or 12V, depending on the type of panel used, it is necessary to measure directly at the LVDS connector. If, with the necessary supply voltages, the TV does not come out of Stand-by mode, does not respond to the remote control and control buttons, you should update the SPI Flash software.
CVMV26L-A-20 can be used in TVs:
SUPRA STV-LC1926WD (Panel M185XW01 V0), SUPRA STV-LC1922WD (Panel MT185GW01 V.0), SUPRA STV-LC2222WD (Panel CLAA215FA), SUPRA STV-LC2622WD (Panel MT215DW01), SUPRA STV-LC1626WD (Panel 720p HD 1600x900), SUPRA STV-LC2417F STV-LC2417FD (Panel M236H1-P01), SUPRA STV-LC1515WD (Panel 720p HD 1366x768), SUPRA STV-LC2422W (Panel M236M1-L01), SUPRA STV-LC2422WD (Panel Panel), THOMSON T24C99H CVMV26L-A (Panel M236H1-L01 Rev.C2).
The main features of the THOMSON T24C99H device:
Installed matrix (LCD-panel) M236H1-L01 Rev. C2.
Matrix control uses Timing Controller (T-CON) LM215WF4-TLE7.
To power the backlight lamps, the MLT019L-CJ inverter is used, controlled by the AZ7500EP-E1 PWM controller (16).
The formation of the necessary supply voltages for all nodes of the THOMSON T24C99H TV is carried out by the MLT019L-CJ power module, or its analogs using the AZ7500EP-E1 (16), KB5150 microcircuits and power switches of the K6A60D type.
MainBoard - the main board (motherboard) is a CVMV26L-A-20 module, using chips TSUMV26KE-LF, YD1517P, K24C32, CVMV26L-A and others.
The F21WT-3BAR-E tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CMO
Model: M236H1-L01
Type: a-Si TFT-LCD, Panel
Diagonal size: 23.6 inch
Resolution: 1920x1080, FHD
Display Mode: TN, Normally White, Transmissive
Active Area: 521.28x293.22 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 1.5 / 3.5 (Tr / Td)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V
LCD TV THOMSON T24C99H with LCD M236H1-L01, diagonal size 24 "(61 cm) 16: 9. Screen brightness 250 cd / m² provided by CCFL (EEFL) lamps. Contrast - the ratio of maximum to minimum brightness is not less than 1000: 1. The design and technical capabilities of the TV allow viewing in high quality HD at a resolution of 1920x1080 pixels in graphic resolution according to the standard 1080p (Full HD). Input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Digital signal formation (graphic format) is produced in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p.
Speaker power of 6 W (2x3 W) is provided by two speakers. The NICAM STEREO audio processing system is used.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, S-Video, SCART, VGA, HDMI. A headphone jack is provided. A standard VGA (D-Sub 15) connector is used to connect a laptop or computer. This interface supports resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768, 1920x1080.
The power consumed by the TV from the network in the operating mode is not more than 60 W.
Overall dimensions: 585x420x190 mm.
Attention! The M236H1-L01 Rev. C2 panel of the THOMSON T24C99H LCD TV is the most expensive component.
Avoid hitting the glass and putting pressure on the screen surface to avoid irreversible damage to the LCD panel!
